Fix swap submit button getting stuck on 'Fetching'

[christianbaroni]

What changed (plus any additional context for devs)

• isLoadingUserAssets was being reset to true during app launch, and not set to false until user assets data was next fetched and set via RQ, resulting in the swap submit button often getting stuck in a 'Fetching' state after a fresh app launch (until the next user assets fetch)
• This is where it's causing the swap submit button issue:

  rainbow/src/__swaps__/screens/Swap/providers/SyncSwapStateAndSharedValues.tsx

  Line 192 in 3bb8e9a

  if (!gasSettings || !estimatedGasLimit || !quote || 'error' in quote || isLoadingNativeNetworkAsset) return;

Screen recordings / screenshots

What to test

[brunobar79]

Launch in simulator or device for 56fe354